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In massive multiple-input multiple-output (MIMO) high-speed train (HST) wireless communication systems (WCS), due to the large-dimension and rapidly time-varying property, channel tracking rather than conventional channel estimation is more feasible. Due to the non-linear channel variation, the channel is first decomposed into sub-channels with different angle of departure. By exploiting the property...
In this study, the authors focus on the tradeoff between spectrum sensing and energy efficiency of cognitive radio networks (CRN). Considering two interference-avoidance schemes, that is, channel handoff and stop-and-wait, the authors, respectively, model the energy efficiency (EE) of CRN as the mean of the throughput-to-power ratio. Research shows that stop-and-wait scheme is a special case of channel...
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